FBM201e輸入卡件
當(dāng)輸入A等于或超過HI或LO限制設(shè)置時，批量開關(guān)的輸出將降低（高從而改變反饋信號并因此改變控制器復(fù)位信號。這將控制器輸出保持在批量開關(guān)極限設(shè)置，并消除復(fù)位飽和。
如果控制器具有較大的比例增益設(shè)置，則重置可能會被修改過多，使得過程可能在啟動條件下低于設(shè)定值。調(diào)整BPL（批量預(yù)加載）以優(yōu)化控制器通過限制批量開關(guān)可以調(diào)節(jié)控制器反饋信號的量來確定啟動條件。
當(dāng)控制器輸出在其正常工作輸出范圍內(nèi)時，批量開關(guān)對控制器沒有影響。
這使得控制器可以針對正常操作條件進(jìn)行最佳調(diào)整，并且批量開關(guān)可以添加：額外補償，非常類似于導(dǎo)數(shù)作用，僅在啟動期間3.2.24偏差-偏差偏置功能塊可以在每個循環(huán)一個的基礎(chǔ)上使用并提供偏置信號的方法，例如外部設(shè)置應(yīng)用程序。輸入A和E（外部偏置）求和，然后添加到操作員可調(diào)偏差
B航跡命令輸入TC被斷言為高（1），將導(dǎo)致塊輸出跟蹤輸入TV，并重新計算偏差
如B＝TV-（A+E）。B的值將被箝位在高限和低限設(shè)置。重要的是要認(rèn)識到輸入和輸出以工程單位和限制為單位必須以預(yù)期的最小值進(jìn)行相應(yīng)調(diào)整以及最大所需范圍值。默認(rèn)值已設(shè)置為-150.00和+150.00，這可能是
使用默認(rèn)范圍0.0時的正常預(yù)期限制設(shè)置為100.0。這些值可以設(shè)置得更低，但具有最大設(shè)置為量程指針值的+/-150%。
如果指針不在，則默認(rèn)范圍為0.00到100.00配置。
例如，如果使用偏置塊以0-6.00 GPM的范圍指針（輸入R）偏置流量設(shè)定點，則
最大偏差調(diào)整應(yīng)為+/-9.00。如果需要該范圍+/-50%的極限調(diào)整，則偏置塊LO限值應(yīng)設(shè)置為-3.00，HI限值設(shè)置為+3.00。如果范圍發(fā)生變化，則電流限制設(shè)置和當(dāng)前偏置值將在新范圍內(nèi)更改為相同的%值。
如果參數(shù)“快速設(shè)置”設(shè)置為“是”，則可以使用快速設(shè)置功能調(diào)整偏差。偏見調(diào)節(jié)旋鈕時，數(shù)值將持續(xù)變化，但當(dāng)最終數(shù)值時，必須按下存儲按鈕以確保在冷加電條件下保持新的偏置設(shè)置。塊的任何未使用輸入將設(shè)置為等于0。
As input A equals or exceeds the HI or LO LIMIT setting,
the output of the batch switch will be either decreased (HI
LIMIT) or increased (LO LIMIT), changing the feedback signal and therefore the controller reset signal. This
maintains controller output at the batch switch limit setting and eliminates reset windup.
If a controller has a large proportional gain setting, the reset can be modified too much, such that the process may
under shoot the setpoint during a startup condition. The BPL (Batch Pre-Load) is adjusted to optimize the controller
for startup conditions by limiting how much the batch switch can adjust the controller feedback signal.
When the controller output is within its normal operating output, the batch switch has no effect on the controller.
This allows the controller to be tuned optimally for normal operating conditions and the batch switch to add
additional compensation, very similar to derivative action, only during startup3.2.24 BIAS - Bias
BIAS function blocks can be used on a one per loop basis
and provide a means to bias a signal, such as the setpoint in
an external set application. Inputs A and E (external bias)
are summed and then added to the operator adjustable bias
B.
Track Command input TC, asserted high (1), will cause the
block output to track input TV and BIAS to be recalculated
as B = TV - (A+E). The value of B will be clamped at the
HI and LO LIMIT settings. It is important to realize that the
inputs and outputs are in engineering units and the limits
must be adjusted accordingly with the expected minimum
and maximum required range values. The default values
have been set to -150.00 and +150.00, which might be the
normal expected limits when using the default range of 0.0
to 100.0. These values can be set lower but have a
maximum setting of +/-150% of the range pointer value.
The default range is 0.00 to 100.00 if the pointer is not
configured.
If, for example, the BIAS block is used to bias a flow setpoint with a range pointer (input R) of 0-6.00 GPM, the
maximum bias adjustments would be +/-9.00. If limit adjustments of +/-50% of this range are desired, then the
BIAS block LO LIMIT should be set at -3.00 and the HI LIMIT at +3.00. If a range change is made the current
LIMIT settings and the current BIAS value will be changed to be the same % value within the new range.
The BIAS can be adjusted using the QUICKSET feature if the parameter QUICKSET is set to YES. The BIAS
value will continuously change as the knob is adjusted but the STORE button must be pressed when the final value
is reached to insure that the new BIAS setting will be retained on a Cold power up condition.
Any unused inputs to the block will be set equal to 0.
